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push_back vs emplace_back

I'm a bit confused regarding the difference between push_back and emplace_back . 7 Answers ...
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Proper usage of Optional.ifPresent()

...Present() takes a Consumer<? super User> as argument. You're passing it an expression whose type is void. So that doesn't compile. A Consumer is intended to be implemented as a lambda expression: Optional<User> user = ... user.ifPresent(theUser -> doSomethingWithUser(theUser)); O...
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Are there constants in JavaScript?

... IE 8, 9 and 10. Some may also need strict mode enabled. You can use var with conventions like ALL_CAPS to show that certain values should not be modified if you need to support older browsers or are working with legacy code: var MY_CONSTANT = "some-value"; ...
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What are the most common naming conventions in C?

...static and skip the module prefix, so if gtk_widget_show() was a function with file scope it would become simply widget_show() with static storage class added. – August Karlstrom Aug 15 '13 at 14:28 ...
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Is Random class thread safe?

Is it valid to share one instance of the Random class between multiple threads? And to call nextInt(int) from multiple threads in particular? ...
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How to add spacing between UITableViewCell

Is there any way to add spacing between UITableViewCell ? 30 Answers 30 ...
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How to solve javax.net.ssl.SSLHandshakeException Error?

I connected with VPN to setup the inventory API to get product list and it works fine. Once I get the result from the web-service and i bind to UI. And also I integrated PayPal with my application for make Express checkout when I make a call for payment I'm facing this error. I use servlet for back-...
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Can I specify multiple users for myself in .gitconfig?

In my ~/.gitconfig , I list my personal email address under [user] , since that's what I want to use for Github repos. 20...
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Is arr.__len__() the preferred way to get the length of an array in Python?

...ust arrays of characters: my_string = 'hello world' len(my_string) # 11 It was intentionally done this way so that lists, tuples and other container types or iterables didn't all need to explicitly implement a public .length() method, instead you can just check the len() of anything that implemen...
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how to delete all cookies of my website in php

I'm wondering if I can delete all my website's cookies when a user click on logout, because I used this as function to delete cookies but it isn't work properly: ...